Python | Convert string List to Nested Character List

Last Updated : 29 Nov, 2019

Sometimes, while working with Python, we can have a problem in which we need to perform interconversion of data. In this article we discuss converting String list to Nested Character list split by comma. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension + split()
The combination of above functionalities can be used to perform this task. In this, we iterate through list using list comprehension and can perform split using split().

# Python3 code to demonstrate working of
# Convert String List to Nested Character List
# using split() + list comprehension
  
# initialize list 
test_list = ["a, b, c", "gfg, is, best", "1, 2, 3"]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Convert String List to Nested Character List
# using split() + list comprehension
res = [char.split(', ') for char in test_list]
  
# printing result
print("List after performing conversion : " + str(res))

Output :

The original list : [‘a, b, c’, ‘gfg, is, best’, ‘1, 2, 3’]
List after performing conversion : [[‘a’, ‘b’, ‘c’], [‘gfg’, ‘is’, ‘best’], [‘1’, ‘2’, ‘3’]]

Method #2 : Using map() + split() + lambda
The combination of above functions can be used to perform this task. In this, we perform the task of iteration using map() and lambda function is used to apply the logic of split using split() to all the list elements.

# Python3 code to demonstrate working of
# Convert String List to Nested Character List
# using map() + split() + lambda
  
# initialize list 
test_list = ["a, b, c", "gfg, is, best", "1, 2, 3"]
  
# printing original list 
print("The original list : " + str(test_list))
  
# Convert String List to Nested Character List
# using map() + split() + lambda
res = list(map(lambda ele: ele.split(', '), test_list))
  
# printing result
print("List after performing conversion : " + str(res))

Output :

The original list : [‘a, b, c’, ‘gfg, is, best’, ‘1, 2, 3’]
List after performing conversion : [[‘a’, ‘b’, ‘c’], [‘gfg’, ‘is’, ‘best’], [‘1’, ‘2’, ‘3’]]

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